fix: auto-sync tasks after editing .

[Hell1213]

Description

Added auto-sync after task editing to eliminate manual sync button click. Backend uses async job queue, so added 1-second delay before syncing to ensure job completes.

• Fixes: After editing tasks in the UI I need to sync #415

Checklist

• Ran npx prettier --write . (for formatting)
• Ran gofmt -w . (for Go backend)
• Ran npm test (for JS/TS testing)
• Added unit tests, if applicable
• Verified all tests pass
• Updated documentation, if needed

Additional Notes

Only frontend change - 3 lines in handleEditTaskOnBackend() to wait for async job then auto-sync.

Screencast.from.2026-01-20.11-10-05.mp4

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[Hell1213]

Added 1-second delay before auto-sync to handle async job queue timing - tested and working smoothly.